Natural History - Fossil Rainbow Shell Ammonite

Displaying a fossil Knightia sp. fish. 621 grams, 15.5 cm



Acquired during the 1980s. From the Pradi Collection, Boston, U.S.A.

In southwest Wyoming (and parts of Colorado and Utah) in the Green River Formation are found some of the world's most outstanding specimens of fossil fish. The Green River system was composed of three lakes: Lake Ulinta, Lake Gosiute and Fossil Lake. These Eocene lakes lay in a series of intermountain basins formed by geological events that uplifted the Rocky Mountains during the early Tertiary time. The climate was much different from the desert-like climate of this area today. Both the fauna (crocodiles, alligators, boa constrictors and some subtropical fish families) and the flora (such as large palm trees) indicate a climate much like that found along the Gulf Coast today. Large amounts of ash found in the sediments indicate that volcanoes were particularly active at this time.

Displaying remains of enamelling and serration, from Carcharodontosaurus saharicus. 5.05 grams, 32 mm



From the Tegana formation of the Sahara Desert, Morocco, North Africa. Acquired during the 1980s. From an old Lincolnshire, UK, collection.

The Carcharodontosaurus saharicus was one of the largest predators of all time (larger than its distant North American T-Rex cousin) and is related to Allosaurus and the South American Giganotosaurus.

Displaying a later carved stylised face with exaggerated facial detailing. 37 grams, 92 mm



From Island of Java, indonesia. Acquired 1950s-1960s. From an old Bristol, UK, paleontological collection.